Improvement in apparatus for forming and cutting sheets of paper-pulp



- F. WURTZBAOI-I. Apparatus for Forming and'Outting Sheets ofPaper-Pulp.

No. 217,666. Patented July'15, I879.

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UNITED STATES PATENT OFFICE.

FRIEDRICH WURTZBAOH, OF CURTISVILLE, MASSACHUSETTS.

IMPROVEMENT IN APPARATUS FOR FORMING AND CUTTING SHEETS OF PAPER-PULP.

Specification forming part of Letters Patent No. 217.666, dated July 15,1879; application filed May 14, 1879.

To all whom it may concern:

Beit known that I, FmnnmoHWijn'rzBAoH, of Ourtisville, in the county ofBerkshire and State of Massachusetts, have invented a new and ImprovedApparatus for forming and cutting Sheets of Paper-Pulp, which inventionis fully set forth in the following specification, reference being hadto the accompanying drawings, in which- Figure 1 represents alongitudinal vertical section. Fig. 2 is a plan or top view.

Similar letters indicate corresponding parts.

This invention consists in the combination, with a press-roller, asheet-forming roller, and with an endless apron which serves to carryoff the sheets after they have been cut, of a cutting mechanism which isgeared together with the sheet-forming roller, so that whenever a layerof sufficient thickness has been formed on the sheet-forming roller thislayer is cut automatically and carried off by the endless apron; also,in the combination, with the sheet-forming roller, and with the apronwhich serves to carry off the sheets after they have been cut, of aknife which is exposed to the action of a weight or spring having atendency to throw said knife toward the sheetforming roller, and a camwhich keeps the knife back against the action of the spring or weightacting thereon, and allows said knife to follow said spring or weightwhenever a layer of sufficient thickness has been formed on thesheet-forming roller.

1n the drawings, the letter A designates a frame of any suitablematerial adapted to form or to support the bearings of the working partsof my apparatus. In this frame is mounted a roller, B, to which apositive revolving motion is imparted by any suitable motive power, andabove this roller B is situated another roller, 0, which revolves byfrictional contact with the roller B, and which can freely rise and fallin its bearings. The wood-pulp is conducted directly from thepulping-machine to the rollers B (l by means of a felt or apron, and assaid rollers revolve in the direction indicated by the arrows markedthereon in Fig. 1, the upper or sheet-forming roller 0 takes up thepulp, so that it becomes covered with a layer of pulp that constantlyincreases in thickness.

The letter D indicates aknife arranged longitudinally along one side ofthe roller 0, on which the layer or pulp is formed, and E indicates anendless carrying-apron for carrying off the pulp in the form of a sheetafter the layer has been se 'ered longitudinally on said roller. Thecuttingknife I) being arranged longitudinally along one side of theroller 0, and immediately above the lower end of the apron E, the lowerend of the layer of pulp, when severed on the roller, will fall behindor in rear of the knife, and the entire sheet be by it directed outwardand upon the rapidlytraveling apron, and the rapid movement of thelatter will tend to draw the sheet from the roller.

In the example shown in the drawings, the knife D is secured to arock-shaft, a, which has its bearin gs in suitable brackets secured tothe frame A, and from which extend two arms, I), from which aresuspended weights 0, which have a tendency to throw the cutting-edge ofthe knife toward the roller 0. It is obvious that springs may besubstituted for the weights 0 without changing the result. From therockshaft to extend also two arms, (I, in a direction opposite to thearms I), and on said arms d is firmly secured a traverse, e, from whichrises a curved lever, f. By the action of the weights 0 the outer orfree end of this lever is held in contact with cam g, which is providedwith one or more depressions, h, so that by its action on the lever fthe cuttingedge of the knife D is held at a distance from the surface ofthe sheet-forming roller 0 until one of the depressions of the cam comesopposite to the end of the lever f, when the knife D is free to followthe action of the weights 0, and to cut the layer of pulp formed on theroller (1.

The cam gis mounted on a shaft, 1,130 which a slow revolving motion isimparted by suita ble gearing from the driving-shaft of my apparatus,and in the example shown in the drawings said cam is provided with onlyone-depression, h, so that for each complete revolution of the same thelayer of pulp formed on the roller 0 will be cut, the speed of the camand of the sheet-forming roller being so adjusted that a layer of pulpof sufficient thickness will form on said roller before the action ofthe knife takes place.

The apron E is stretched round rollers j k,

and the roller 70 connects by a belt, Z, with a pulley, m, mounted onthe driving-shaft of my apparatus, so that a rapid revolving motion isimparted to it, causing the apron E to move in the direction of thearrow marked on it in Fig. l with a velocity which is greater than thatof the felt that serves to feed the pulp to the rollers B 0. As soon asthe layer of pulp on the sheet-forming roller 0 has been cut by theknife, said layer is received upon the apron E in the form of a flatsheet, and carried off with great rapidity, so that the cut sheet willnot carry off any of the pulp which is fed to the rollers B O by thefelt. By these means the operation of cutting the sheets is performedautomatically, and the expense of having this operation performed byhand-labor is saved.

It is obvious that the position and the shape of the knife D may bechanged from that shown in the drawings; but its position should be suchthat when said knife is thrown toward the sheet-forming roller itscutting-edge will not be permitted to come in contact with and injurethe surface of said roller.-

\Vhat I claim as new, and desire to secure by Letters Patent, is

1. A machine for forming and cutting sheets of paper, embodying in itsconstruction the combination of a sheet-forming roller, a press roller,a knife arranged longitudinally along one side of the latter, mechanism,such substantially as described, for carrying said knife at statedintervals toward the sheet-forming roller for severing the sheet thereonin a longitndinal line, and an endless apron for carrying of the sheetsafter they have been severed by the knife, all essentially as shown anddescribed.

2. The combination, with the sheet-forming roller 0 and the apron E, ofa knife, D, a spring or weight having a tendency to throw said knifetoward the roller G, and a cam which keeps the knife back against theaction of its weight or spring, and allows said knife to act whenever alayer of pulp of sufliciel'it thickness has been formed on thesheet-forming roller, substantiallyin the manner shown and described.

.In testimony that I claim the foregoing I have hereunto set my hand andseal this 19th day of April, 1879.

FRIEDRICH WURTZBAOH. [L. s.]

Witnesses:

H. M. BURRALL, F. HOFFMANN.

